I got tickets in May when Robert Plant was on. It is a good night if you are open to all kinds of music. They first filmed the Friday show and then went 'Live' for the Tuesday show.
If you get tickets DO wear dark clothing otherwise they will shove you in the back where it will be difficult to see and there will be less chance of seeing yourself on TV.

We were allowed to take a small bag into the studio and they didn't stop me taking in my phone and camera, despite all the warnings. But they do have a free cloakroom service.